details The phantom training mask is a revolutionary, innovative training device that takes your physical condition and overall performance in sports to the next level. Train your respiratory muscles and increase your athletic performance Change resistance levels during training without removing the mask Ergonomic sleeve provides a comfortable grip and prevents slipping Premium materials, such as medical silicone and durable nylon Customize your training mask with interchangeable covers and sleeves Easy to disassemble and clean sized You can easily find the right size via your body weight in our size recommendation: up to 70 kg: small 70 - 100 kg: medium from 100 kg: large Not quite sure about the size? We'll be happy to help you via phone, email, and Facebook Messenger.